Glass-cutting grinder.



No. 898,028. PATENTED SEPT. 8, 1908' J. T YisUI T-;

GLASS OUTTIEJG GRENDER,

APPLIOATION FILED JUHTY 24, 1907.

UNITED STATES PATENT OFFICE.

JOHN T. YOUNG, OF ELMIRA, NEW YORK, ASSIGNOR OF ONE-HALF TO BENJAMIN N. PAYNE,

OF ELMIRA, .NEW YORK. v

GLASS-CUTTING GRINDER Specification of Letters Patent. Application filed June 24, 1907. Serial No. 380,448.

Patented Sept. s, 1908.

To all whom it may concern:

Be it known that 1, JOHN T. YoUNG, a

citizen of the United States, residing at the the operator mani ulating the glass against the beveled rim 0 the disk.

M mvention' is brought about by reason of t e frequent necessity of changing the pulleys and disks on these grinders, in which the present method of using pulleys and disks with. plain or smooth holes in their centers slipplng loosely on a plain shaft adjoining shoulders, is attended with continuous difficulty, of having the shaft and grinding disk run absolutely true which is highly essential in the work to be done. My object is to remedy this, and I accomplish the pur pose by the special constructions, and methods of forming and uniting the pulley and the disk with the shaft. g

In the drawings Figure 1 is an elevation of the shaft or arbor, with the pulley and disk thereon, 'which are shown with a portion of the afrbor and flange in section. This view also shows and includes at the left a ortion of the frame, showing the adjustable earing ,block providing a center for receiving and 7 Fig. 3 is a plan view of the said standard of I --more fully the frame and showing a part of the cross bars of the frame work which supports the standards. Fig. 4 is a left side end elevation of the frame and shaft and bearing block, but showing only a portion of the cross bars of the frame, with a glass dish represented being cut by the disk. l Fig. 5 is a view in detail of the left side of the pulley. Fig. 6 is a perspective view of the same pulley to show the outer formation of its hub. Fi 7 is a view in detail of the opposite or rig t hand side of the pulley. Fig. 8 is a sece pulley and tional view of'the shaft on the line (1/ y looking in direction of the arrow point.

As the lower portions of the frame standards and frame parts do not particularly relate to my improvements, t ey may be of any suitable construction. I have shown on y sufficient thereof, to show how the frame standards A A may be sup orted in upright manner to hold my latera fy adjustable bearing blocks B B at each end of the shaft C, said shaft being tapered at each end to form true axial centers D D, extending into the end of the bearing blocks and on which the shaft truly revolves. Each block B is halved into a standard A and provided with a slot, E, so that they may slide laterally towards or from each other and be held in any adjusted position by the grip bolts, F, which pass through the standards, A and slots, E, of the blocks. Each bolt has on it a washer, G, and a handle nut H, the turning of which serves to grip the block at any oint of its movement rigidly with the standard of the frame. The arbor shaft C, near its central part, is provided with a rigidly fixed flange or collar C which is formed with annular ribs or shoulders I and J, that are faced or turned truly at right angles with the axis of the shaft, see Fig. 8. 'Said shaft is provided with a right hand screw thread K, which leads up to the flange or collar C. The grinding disk L is fitted with a central hole threaded to and'to screw truly up against the annular shoulders I J of the flange G. 'As these grinding disks L are of various sizes, and frequently changed upon the shaft in being operated, it will be noted that after once hefit the threads on the shaft,

ing threaded, and fitted to the shoulders I J on the shaft, that whenever removed and re-' time to the same point of contact, thus assuring their balance with the shaft as when first trued thereon, but which would not be the case, if they were held to the shoulder of the flange bya nut screwed against them, with the hap-hazard placing or turning of the disk forming new points of contact, thus slightly unbalancing it on the shaft, and causing the shaft to wabble, which is the old way of securing the disk.

Near the left end of the shaft is a collar or flange M, which is provided with a erfectly true angular face N to the axis of t e shaft.

Beyond this flange the shaft at its end' is ingdiskL tachment to the sha t, so one may be quickly removed and substituted by another pulleyof greater or less diameter as may be desired, the form of the pulley hub, in each pulley, being suchin'its attachment to the shaft,

. like the disk, as "to always return to its original points of contact with the shaft on removal and replacement.

To further facilitate the true centering of the pulleys u on the shaft in their frequent removals an replacing thereon, I have cut away the center of the pulley hub, to the de th of the pulley face or rim to form a conica opening or chamber P around the shaft adjoining the shoulder N, and have extended the hub Q beyond the pulley rim at the bottom of the chamber, and have fitted same with a threa'ded hole R to fit the thread on the shaft, and'which serves to screw the o posite annular face S of the hub, outside I; e chamber, which has been trul turned, up against the shoulder N of the shaft.

The principle of self centering which this form of pulley may suggest, in addition to its always refitting on the same point of contact with the-shaft, ma be noted as follows :The formation of the c amber and screw, permits the pulley to swing slightl laterally in any direction until all points of the hub S and shoulder N, are equalized under the pressure of the screw of the hub, that is to say, the screw of the hub being within, or nearer the axis of the shaft, tends to give radial or outward pressure at every oint of the hub S, on the resisting shoulder N, until contact between the pulle is centered by the places of resistance on the shoulder moving to equalization.

The resistive action of grinding the glass on the periphery of the disk, see Fig. 4, is adverse to the drlving direction of rotation of the pulley, so that the operation tends to more firmly grip both disk and pulley against their respective shoulders.

The extended end ofthe-pullefi hub Q, has been squared on its outside, see 'gs. 5 and 6,

.so that a wrench may be a plied thereto on the first setting of the pu ey on the shaft when it may be desired.

I claim 1. The combination of a shaft provided with a flan e or collar and a screw-thread near said co ar, of a driving-pulley having a part of its hub recessed and out of contact with the shaft and another part threaded and screwed on to the shaft, the inner face of the hub around the-recess being held against the face of said flange or collar, for. the purpose specified.

2. The combination of a shaft provided with two flanges formed with oppositely arranged screw-tbreads adjacent said flanges and leading to the faced sides thereof and one of which flanges is formed with annular ribs, a grinding-disk screwed u against the face of said ribbed flange an having a part of its hub recessed an out of contact with the shaft and another art screwed on to the shaft, the inner face 0 the hub around the recessed ortion bein held against the faced side of the adjacent ange, for the purpose specified.

a drivin -pulley In testimony whereof I affix my signature Witnesses:

STEPHEN B. WATKINS, MARCUS M. JORDAN. 

